Kooltronic Guardian Series User manual

Keep This Manual
With Air Conditioner
AIR CONDITIONER
OPERATOR'S MANUAL
CAUTION
BEFORE INSTALLING AND
USING THIS AIR CONDITIONER,
IT IS IMPORTANT THAT THIS
MANUAL BE READ AND
UNDERSTOOD THOROUGHLY
KOOLTRONIC, INC.
30 Pennington-Hopewell Road
Pennington, NJ 08534
609•466-3400
FAX: 609 • 466-1114
www.kooltronic.com
900-039-71 (7/19)
(CDR: 20172)
480 VOLT
GUARDIAN SERIES
K3NA6C26DP60L
Find additional information on
this model at kooltronic.com or
use the Technical Documents
QR code below.
Technical
Documents

2
TABLE OF CONTENTS
Page
I. Introduction 2
II. Incoming Inspection 3
III. Product Handling 3
IV. Product Identification and Nameplate 4
V. Principles of Operation 5 - 8
VI. Pre-Installation Testing 9
VII. Specific Model Data 10 - 13
Mounting
Drawings and Dimensions
Technical Data
Major Component Replacements
Standard Features
VIII. Maintenance 14 - 15
IX. Trouble Shooting 15 - 16
X. Warranty 17
NOTE: Wiring Schematics are available on the specific model page of the Kooltronic website.
I. Introduction
Kooltronic Air Conditioners are designed to provide a cool, dehumidified environment for your electronic
components. There are models to fit virtually all sizes and shapes of electronics enclosures, in
capacities ranging from 1,000 to 30,000 BTU/H. Our "closed-loop" design also ensures that your
components will not be exposed to hot, dirty operating conditions.
This Manual provides you with the necessary general information for properly installing and operating
standard Kooltronic Air Conditioners. Technical data and mounting instructions are presented on pages
10 through 13.

3
II. Incoming Inspection
Kooltronic Air Conditioners are designed, built and packaged to withstand the shock and vibration normally
associated with shipment by common carriers. Occasionally improper handling during shipping causes damage.
Such handling could include unbanding of palletized shipments, failing to respect "This Side Up" arrows, rough
handling, falling off conveyors, excessive vibration, crushing, etc. Therefore, a thorough inspection should be
done upon receipt of all shipments. Any carton tears, dents, scratches, loose articles or evidence of oil are signs
of damage and should be noted on the Freight Bill. Cartons should be opened promptly and the units inspected
for CONCEALED DAMAGE. Kooltronic Air Conditioners must be delivered in the proper mounting position to
assure that damage to the compressor has not occurred during shipping. Any Kooltronic Air Conditioner that is
delivered removed from the banded pallet, lying down or double stacked should be refused.
An immediate claim MUST be filed with the freight carrier and an inspection requested. Retain all packing
materials. Kooltronic cannot assume responsibility for Consignee's failure to file a timely freight claim.
III. Product Handling:
1) Do not attempt to operate your Kooltronic Air Conditioner until you read and thoroughly understand this
Manual. See section VI PRE-INSTALLATION TESTING.
2) Before operating the Kooltronic Air Conditioner be certain that it is placed in its correct mounting position.
This Air Conditioner is designed to operate in a vertical position only. This placement must be done
a minimum of 5 minutes prior to operating in order to allow the compressor oil to drain to the compressor
sump area.
CAUTION
3) Before operating this unit, all electrical wiring must be checked to assure the proper connection to the
correct power source. Minimum circuit ampacity should be at least 125% of the amperage found on the
nameplate for the corresponding voltage. Do not exceed the maximum fuse size found on the nameplate.
4) We do not recommend that Air Conditioners be shipped to their final destination attached to an enclosure.
In the event that the Air Conditioner needs to be shipped attached to an enclosure it is strongly
recommended that proper support be provided for the Air Conditioner. Excessive vibration can occur if Air
Conditioners are not properly supported when shipped on enclosures, increasing the potential for internal
damage and voiding the warranty.
5) PROCEDURE FOR PROPER PACKING AND SHIPMENT OF KOOLTRONIC AIR
CONDITIONERS:
■Keep Air Conditioner in proper upright position indicated by arrow markers.
■Pack Air Conditioner in an appropriate carton (preferably original carton if possible), with
adequate internal protective packaging, making sure carton is marked and is kept in correct
upright position.
■For local, controlled transportation, strap carton to a secure part of truck to prevent falling or
sliding, minimize vibration, etc.
■For common carrier shipment, band unit(s) securely to a pallet. Unpalleted shipment risks
severe damage which voids the warranty.
Kooltronic Air Conditioners must be operated in their proper mounting position. If attempts are
made to operate a unit that is not in its designed mounting position, permanent compressor
damage will occur. This action will void the warranty. To avoid compressor damage do not tip the
unit more than 45° from its proper mounting position.

4
IV. Product Identification and Nameplate
Each Kooltronic Air Conditioner includes an identification nameplate. This nameplate provides:
qModel Number
wSerial Number
eCooling/heating capacity
rElectrical power characteristics
tType and amount of regrigerant required for recharging
yDesign Pressure
uMinimum and maximum ambient operating temperatures
iManufacturing Order Number
oFilter Part Number
aUnderwriters Laboratories Inc. Listed or Recognized Marks and NEMA ratings
We recommend you copy this information from your unit.
qwi When ordering parts, specify the Model Number, Serial Number & MFG. Order Number.
eBefore operating, be sure that the power source matches these requirements.
yUse of incorrect type or amount of refrigerant will adversely affect performance and may damage the unit.
r Make sure that these parameters are met. Failure to do so may result in permanent damage to the unit.
UNAUTHORIZED SERVICE OR MODIFICATION VIOLATES WARRANTY
Heating BTU/H:
Cooling BTU/H:
Max:
Ambient Temperature: Min:
P.S.I.G.
P.S.I.G.
Design Pressure, Low Side:
Design Pressure, High Side:
Oz. Factory ChargeRefrigerant:
Max. Fuse Size / HACR Type Circuit Breaker:
Min. Circuit Ampacity:
Watts:Amps:VoltsElectric Heater:
R.L.A.:L.R.A.:VoltsCompressor:
Amps:Hp:VoltsCondenser Fan Motor:
Amps:Hp:VoltsEvaporator Fan Motor:
Hertz:Phase:Volts
OUTDOOR USE
COMPARTMENT ONLY
NEMA/EEMAC/UL50 BY UNDERWRITERS LABORATORIES, INC.
TYPE 1 SPECIAL PURPOSE AIR CONDITIONER EQUIPMENT
TYPE 3R, 12 & 4 INTERFACE TO THE ELECTRICAL ENCLOSURE ONLY
NEMA/EEMAC/UL50 BY UNDERWRITERS LABORATORIES, INC.
SPECIAL PURPOSE AIR CONDITIONER
ALL MOTORS ARE THERMALLY PROTECTED
Air Conditioner
Mfg. Order No.:
KOOLTRONIC, INC. PENNINGTON, NJ
MANUFACTURED BY:
Rated Voltage:
Serial No.Model No.
LISTED 84H7
SPECIAL PURPOSE
AIR CONDITIONER
qw
ee
rrr
rrr
rr
r
r
rrr
r
r
tt
y
y
uu
i
o
rr
Filter P/N:
a

5
V. Principles of Operation
Kooltronic Air Conditioners are required when the equipment operating
temperature must be kept near or lower than the ambient room temperature,
and/or the cabinet must be sealed from dust, fumes, oil, corrosives and other
contaminants. These Air Conditioners utilize a "Closed-Loop Cooling System"
to ensure optimum performance of the installed components.
Closed-Loop cooling seals the electronic enclosure from hostile elements in
the environment.Two separate circulation systems are employed. The internal
system cools and dehumidifies the air inside the cabinet, totally isolating the
sensitive electronics and other components from the environment. The
external system uses circulating ambient air or water to discharge the heat
removed from the electronics. The heat is dissipated from the enclosure by
means of the vapor compression refrigeration cycle. This takes place in a
hermetically-sealed refrigeration system, utilizing either an air-cooled or
water-cooled condenser heat exchanger. The warm air inside the enclosure is
drawn through the evaporator coil where it is cooled, dehumidified and
returned.
Any enclosure moisture accumulated on the evaporator coil is collected in the
condensate tray and removed through the drain tube to the condensate
evaporator. Condensate evaporates in the condensate evaporator and is
released to the ambient air by the condenser impeller.
The heat removed through the evaporator coil is transferred by the compressed refrigerant to the condenser coil. Ambient
air is then passed through the condenser coil, where it absorbs the heat and is then discharged to the environment.
When the Kooltronic Air Conditioner is properly sized it should operate constantly and maintain 75°F to 115°F enclosure
temperature, depending on the ambient temperatures.
UNITS EQUIPPED WITH PROGRAMMABLE THERMOSTAT
For units equipped with Low Temperature Thermostat, see page 8.
CONTROL ACTION
The evaporator blower operates continuously. The compressor is cycled on
and off by the action from the factory preset programmable thermostat. A
pressure switch controls the on/off action of the condenser blower.
The regulation is performed according to the temperature measured by the
thermostat probe with a positive differential from the set point: if the
temperature increases and reaches set point plus differential the compressor
is started and then turned off when the temperature reaches the set point
value again.
In case of fault in the thermostat probe the start and stop of the compressor
are timed through preset parameters.
The programmable thermostat is located as shown in the upper right ISO illustration. WARNING: the programmable device
is preprogrammed and set at the factory. In the event changes are needed the following instructions can be used.
FRONT PANEL COMMANDS
FRONT PANEL LED INDICATORS
- To display target set point; in programming mode it selects a parameter or confirms an operation.
(UP) - To see the max. stored temperature; in programming mode it browses the parameter codes or increases the displayed value.
(DOWN) - To see the min. stored temperature; in programming mode it browses the parameter codes or decreases the displayed value.
- To switch the instrument off, if onF = oFF.
- Not enabled.
(DEF) - To start a manual defrost.
KEY COMBINATIONS
To lock and unlock the keyboard.
To return to the room temperature display.
To enter programming mode.
CONDENSER
AIR OUT
CONDENSER
AIR IN
(2) PLACES
SUPPLY
AIR OUT
RETURN
AIR IN
CONDENSER
AIR IN
(2) PLACES
PROGRAMMABLE
THERMOSTAT
K3NA6C26DP60L

Principles of Operation (con’t)
MAX AND MIN TEMPERATURE MEMORIZATION
HOW TO SEE THE MIN TEMPERATURE:
1) Press and release the down arrow key.
2) The “Lo” message will be displayed followed
by the minimum temperature recorded.
3) Press the down arrow key again or wait 5 seconds
to restore normal display.
HOW TO SEE THE MAX TEMPERATURE:
1) Press and release the up arrow key.
2) The “Hi” message will be displayed followed
by the maximum temperature recorded.
3) Press the up arrow key again or wait 5 seconds to
restore normal display.
HOW TO RESET THE MAX AND MIN TEMPERATURE
RECORDED:
1) Press the SET key for more than 3 seconds while the
max or min temperature is displayed. (rSt message
will be displayed.)
2) To confirm the operation, the “rSt” message starts
blinking and the normal temperature will be displayed.
MAIN FUNCTIONS
HOW TO SEE THE SETPOINT:
1) Press and immediately release the SET key.
The display will show the set point value.
2) Press and immediately release the SET key, or
wait 5 seconds to display the probe value again.
HOW TO CHANGE THE SETPOINT:
NOTE: The standard set point is 75°.
1) Press the SET key for more than 2 seconds to
change the set point value.
2) The value of the set point will be displayed and
the °C or °F LED starts blinking.
3) To change the set value push the up or down
arrow keys within 10 seconds.
4) To store the new set point value push the SET
key again, or wait 10 seconds.
HOW TO CHANGE A PARAMETER VALUE:
To change a parameter’s value, operate as follows:
1) Enter the Programming mode by pressing the
SET plus down arrow keys for 3 seconds (the
°C or °F LED starts blinking).
6
2) Select the required parameter. Press the SET
key to display its value.
3) Use up or down arrow keys to change its value.
4) Press SET to store the new value and move to
the following parameter. To exit, press SET and
the up arrow keys or wait 15 seconds without
pressing a key.
NOTE: The set value is stored even when the
procedure is exited by waiting for the time-out
to expire.
HOW TO LOCK THE KEYBOARD:
1) Press and hold the up and down arrow keys
simultaneously for more than 3 seconds.
2) The POF message will be displayed, and the
keyboard will be locked. At this point, it will only
be possible to see the set point or the MAX or
MIN temperature stored.
3) If a key is pressed more than 3 seconds, the
POF message will be displayed.
HOW TO UNLOCK THE KEYBOARD:
1) Press and hold the up and down arrow keys
simultaneously for more than 3 seconds until
the Pon message is displayed.
OPTIONAL MONITORING SYSTEM
TTL SERIAL LINE - FOR OPTIONAL MONITORING
SYSTEMS:
The optional TTL serial line, available through the
HOT KEY connector, allows through the use of
the external TTL/RS485 converter, connection of
this digital converter to a monitoring system that is
ModBUS-RTU compatible (X-WEB500/3000/300).
Connections are provided through an external 2-
position terminal block.

Principles of Operation (con’t)
RESETTING
If it becomes necessary to reset the unit, the factory settings are as follows:
7
PARAMETER DESCRIPTION VALUE UNIT RANGE
MINIMUM MAXIMUM
SEt Set Point 75 °F 60 95
Hy Differential 10 °F 1 45
dP4 Fourth probe display 0 -- -- --
dP3 Third probe display 0 -- -- --
dP2 Evaporator probe display 0 -- -- --
dP1 Room probe display 0 -- -- --
AFH Differential for temperature alarm recovery 2 °F 1 45
ALL Minimum temperature alarm 35 °F -67 120
ALU Maximum temperature alarm 120 °F 35 302
SHy Differential for auxiliary relay 5 °F 1 45
SAA Set point for auxiliary relay 115 °F -67 302
ACH Kind of action for auxiliary relay CL -- -- --
AC Anti-short cycle delay 2 min 0 50
odS Outputs delay at start up 0 min 0 255
P2P Evaporator probe presence n -- -- --
ot Thermostat probe calibration 0 °F -21 21
US Maximum set point 95 °F 75 302
LS Minimum set point 60 °F -67 75
Ptb Map code 7 -- 0 65535
rEL Software release 0 -- -- --
rSE Real set point 0 -- -- --
onF on/off key enabling ES -- -- --
PbC Kind of probe ntc -- -- --
Adr Serial address 1 -- 1 247
HES Differential for energy saving 0 °F -54 54
rrd Regulation restart with door open alarm y -- -- --
odc Compress status when open door no -- -- --
nPS Number of activation of pressure switch 15 -- 0 15
did Digital input alarm delay 5 min 0 255
i1F Digital input configuration EAL -- -- --
i1P Digital input polarity cL -- -- --
dAO Delay of temperature alarm at startup 00:00 h -- --
ALd Temperature alarm delay 0 min 0 255
ALc Temperature alarms configuration Ab -- -- --
ArP Probe selection for auxiliary alarm P1 -- -- --
dLy Display temperature alarm 00:00 min. 0 20
Lod Probe displayed P1 -- -- --
rES Resolution in -- -- --
CF Temperature measurement unit F -- -- --
CH Kind of action: heating cooling cL -- -- --
COF Compressor OFF time with faulty probe 4 min 0 255
COn Compressor ON time with faulty probe 20 min 0 255
O4 Fourth probe calibration 0 °F -21 21
P4P Fourth probe presence n -- -- --
O3 Third probe calibration 0 °F -21 21
P3P Third probe presence n -- -- --
OE Evaporator probe calibration 0 °F -21 21

Principles of Operation (con’t)
UNITS EQUIPPED WITH LOW TEMPERATURE THERMOSTAT
A Low Temperature Thermostat prevents the evaporator coil from
freezing. In conditions of low ambient temperature and low
enclosure load, the thermostat regulates the return air
temperature from 75°F to 86°F. The standard set point of the
Low Temperature Thermostat is 75°F. The set point can be
changed to 70°F or to 79°F by changing the location of the
thermostat jumper (See illustrations on page 11).
The Low Temperature Thermostat has a test start relay. When
the air conditioner is turned on it will run constantly for the first 15
minutes regardless of external temperatures. Afterwards, if the
entering evaporator air temperature is lower than the thermostat
set point, the compressor and condenser blower will stop, and
the thermostat will begin to control the air conditioner.
The heater kit consists of a heater, a heat control thermostat and
a heater limiter. The heater control thermostat is a bimetal disk
with a fixed set point of 60°F. When the entering evaporator air
temperature rises above 60°F the heater shuts off, and when the
evaporator air temperature falls below 40°F the heater will
engage. The contact points of the alarm thermostat are normally
closed. If the entering evaporator air temperature exceeds 130°F
the alarm thermostat contacts open, and when the temperature
drops below 130°F the contacts close. In applications having
frequent voluntary heat load fluctuations, an optional Compressor Short Cycle Protector is recommended.
8
CONDENSER
AIR OUT
CONDENSER
AIR IN
(2) PLACES
SUPPLY
AIR OUT
RETURN
AIR IN
CONDENSER
A
IR IN
(2) PLACES
K3NA6C26DP60L

9
VI. Pre-Installation Testing
Before mounting the air conditioner to the enclosure, test for proper operation. This will verify the shipping
integrity of the system. Please follow the steps below prior to installation.
CAUTION
1. The unit must sit in an upright position at a minimum room temperature of 65°F to allow the system to
warm-up. This is particularly important during winter months.
2. Refer to the nameplate for proper electrical voltage and current requirements. Connect the power cord
to a properly grounded and fused electrical supply, leaving electrical power to the unit turned off.
3. Note the factory thermostat setting which is 70oF.
4. Turn the electrical power on.
5. Verify that the evaporator blower or fan is running.
6. Verify that the condenser blower or fan is running.
NOTE: Models with Programmable Thermostat follow 7 through 10. Models with Low Temperature
Thermostat, follow 8 through 10.
7. Observe the temperature on the digital display. The thermostat must be set a minimum of 10°F below
this temperature for the compressor to operate (the factory setting is 75°F). Refer to page 6 for
instructions on adjustment of the thermostat.
8. Operate the air conditioner for approximately ten (10) minutes. During this period no unusual noise or
vibration should be evident. Both the evaporator and condenser fans or blowers should be delivering
air through their respective discharge ports. The cool air discharged should be less than 70°F when
the room temperature is between 70°F and 80°F. It is normal for the condenser blower to cycle on/off
during this period.
9. Turn off the electrical power and disconnect the air conditioner from the power source.
10. If a cover plug was removed to adjust the unit, be sure to replace it in order to maintain the integrity
of the closed-loop airflow system.
NOTE: Before shipment all Kooltronic Air Conditioners are subjected to a performance test.
The air conditioner must be standing in its proper mounting position for a minimum of five
(5) minutes prior to testing. Failure to follow this procedure will cause permanent damage to
the compressor. To avoid compressor damage do not tip the unit more than 45° from its
proper mounting position.

10
If the air conditioner is mounted to the cabinet door you must be sure that the door hinges
will support the additional weight of the air conditioner. Also be certain that when the door
is opened fully, the cabinet does not become unbalanced. The actual weight of the unit can
be found in the Technical Data on page 13.
MOUNTING DRAWING
A/C
UNIT
MOUNTING BRACKET
MOUNTED ONTO
CUSTOMER’S ENCLOSURE
ENCLOSURE WALL
WASHER W/ NEOPRENE (8)
(NEOPRENE SIDE AGAINST
ENCLOSURE)
1/4" NUT (3)
STUD FROM BRACKET (3)
1/4" CAGE NUT
ON THE INSIDE
OF A/C UNIT (8)
WASHER W/ NEOPRENE (8)
(NEOPRENE SIDE AGAINST
ENCLOSURE)
1/4" HEX BOLT
1-1/4" LONG (8)
1. It is recommended that a lift truck be used for
installation
2. Attach the mounting bracket to the enclosure using
(3) 1/4-inch nuts, (3) sealing washers and (3) 1/4-inch
mounting nuts. Sealing washers must be placed
against customer enclosure (see mounting
drawing).
3. Place the air conditioner on the lift truck.
4. Adjust the lift truck height so that the air conditioner
hook is located approximately 1/2-inch above the
mounting bracket.
5. Move the air conditioner toward the enclosure panel
so that the gap between the hook and the
enclosure is about 1/2-inch.
6. Slowly move the lift truck down until the hook
engages with the mounting bracket. Continue to
lower the lift truck. The air conditioner will hang from
the mounting bracket flush against the mounting
panel.
7. Insert (8) 1/4-inch hex bolts with sealing washers
through mounting holes in the enclosure into cage
nuts in the air conditioner and tighten (see
mounting drawing).
CAUTION
250060-00-00 - Rev. C
VII. Specific Model Data
Mounting
The Kooltronic Special Purpose Air Conditioners K3NA6C26DP60L have been engineered to be installed easily.
Prior to mounting, refer to pages 8 and 9 for the drawings showing dimensions and locations of mounting holes
and cutouts. Prior to cutting or drilling, make sure that cutouts and mounting holes do not interfere with components
inside the cabinet. To avoid damaging your air conditioner, please read the following information before installation:
External Mounting

11
Drawings and Dimensions
(11) .312 [7.9]
DIA. HOLES
10.56
[268.2]
10.56
[268.2]
1.42
[36.0]
22.03
[559.6]
TYP.
14.67
[372.6]
7.87
[199.9]
16.31
[414.3]
TYP.
18.81
[477.8]
TYP.
1.00
[25.4]
TYP.
19.72
[500.9]
2.58
[65.5]
10.20
[259.1]
TYP.
20.40
[518.2]
TYP.
15.18
[385.6]
17.34
[440.4]
1.20
[30.5]
1.93
[49.0]
1.78
[45.2]
TYP.
1
2
MOUNTING PLAN
Dimensions, inches [mm], are for reference only and are subject to change.
2.06
[52.3]
.17
[4.3]
2.60
[66.0]
2
1
1
24
3J2
345
10 9876
123
J1
CG
RELAY
CONTACTS
N.O.
240 VAC
120 VAC
TEMPERATURE
SENSOR
Mounting Holes (4)
.156 [3.9] DIA.
ADJUSTING
PINS
3
214
70ºF - Connect 1 and 2
75ºF - Connect 1 and 3
79ºF - Connect 1 and 4
Thermostat Jumper
ELECTRONIC THERMOSTAT CONTROL
Electronic Thermostat Control
Dimensions, inches [mm], are for reference only and are subject to change.
WARM AIR RETURN FROM
ENCLOSURE
COOL AIR OUTLET
TO ENCLOSURE
1
2
K3NA4C26DP60L

12
18.50
[469.9]
4.06
[103.2]
7.76
[197.1]
6.53
[165.9]
4.16
[105.8]
4.06
[103.2]
24.14
[613.2]
MOUNTING BRACKET TO BE INSTALLED ON CUSTOMER ENCLOSURE
19.72
[500.9]
16.31
[414.3]
5.45
[138.4]
7.71 DIA.
[195.9]
1.00
[25.4]
TYP.
18.81
[477.9]
DRAIN
15.53
[394.5]
20.91
[531.2]
19.98
[507.5]
19.03
[483.4]
39.67
[1007.7]
20.38
[517.5]
60.20
[1529.0]
13.02
[330.8]
23.73
[602.9]
40.56
[1030.1]
(8) 1/4"
NUTS
3PH POWER
CONNECTIONS
PROGRAMMABLE THERMOSTAT
31.71
[805.3] 17.34
[440.4]
1.90
[48.3]
20.40
[518.1]
TYP.
10.20
[259.1]
TYP.
1.75
[44.5]
1.87
[47.5]
TYP.
.15
[3.8]
1.46
[37.1]
2.10
[53.2]
2
4
1
3
1
K3NA4C26DP60L
Dimensions, inches [mm], are for reference only and are subject to change.
Drawings and Dimensions
FILTERED CONDENSER
AIR INLET (Ambient Air In)
CONDENSER OUTLET
(Warm Ambient Air Out)
WARM AIR RETURN FROM
ENCLOSURE
COOL AIR OUTLET
TO ENCLOSURE
1
2
3
4
GA250061A

13
Technical Data
K3NA6C26DP60L 26000 22240 125/-20 480 60 8.7 262
BTU/H Ambient Running Approximate
Capacity BTU/H Temp. °F Amps Weight
Model 60/50 Hz 95°F/95°F Max./Min. Volts Hz 125°F/125°F (lbs.)
Major Component Replacements
K3NA6C26DP60L K3NA6C26DP60L
(Units with (Units with
Low Temperature Programmable
K3NA6C26DP60L Thermostat) Thermostat
Part Part Number* Part Number** Part Number)**
Compressor 0665-423 0665-417 0665-417
Condenser Blower Motor 0261-297 0261-297 0261-297
Condenser Blower Capacitor 0452-12 0452-12 0452-12
Condenser Blower Pressure Switch 0712-35 N/A 0712-35
Evaporator Impeller 0194-50 0194-50 0194-50
Evaporator Impeller Capacitor 0452-05 0452-05 0452-05
Condenser Coil 0666-63 0666-63 0666-63
Evaporator Coil 0667-58 0667-58 0667-58
Condenser Thermostat N/A 0750-117 N/A
Condenser Thermostat Sensor N/A 0750-117-01 N/A
Condenser Blower Contactor 0694-93 0694-93 0694-93
Compressor Contactor 0694-93 0694-93 0694-93
Thermostat 0750-137 0750-116 0750-137
Thermostat Sensor 0750-136-01 0750-117-01 0750-136-01
Power Transformer 0932-41 0932-41 0932-41
Fuses (2-1/4 Amp) 0916-30 0916-30 0916-30
High Pressure Switch 0712-32 0712-32 0712-32
Phase Protector 0694-73 N/A N/A
Standard Features
Baked Powder Finish (NEMA 4 models)
Closed-Loop Cooling
Compressor Short Cycle Protector
Condenser Blower Controller
Epoxy-Coated Condenser and Evaporator Coils
External junction box for permanent wiring connections
Filters (2)
Heavy-duty Steel Shell (NEMA 4 models)
Internal Corrosion Protection (NEMA 4X models)
NEMA 12, 3R and 4 Ratings Maintained (UL50)
Programmable Temperature Alarm
Programmable Thermostat
Stainless Steel Shell (NEMA 4X models)
UL/CUL Listed
Zero ODP Refrigerant
GuardianX NEMA 4X model offered
with these additional features
NEMA 4X Rating Maintained (UL50)
Internal Corrosion Protection
Stainless Steel Shell
Accessories and Options
Enclosure Heater
Filter Recoating Adhesive
Lead-Lag Controller
Remote Monitoring
Remote Thermostat Relay
Replacement Filters
Special paint finishes
Units in BOLD are current standard products. Other units are prior product offerings and shown for reference only.
*Units with serial numbers B19A0377 and above. **Units with serial numbers up to and including M18A4346.
K3NA6C26DP60L 26000 22800 131/-20 480 60 7.4 262
BTU/H Ambient Running Approximate
Capacity BTU/H Temp. °F Amps Weight
Model 60/50 Hz 95°F/95°F Max./Min. Volts Hz 131°F/131°F (lbs.)

14
VIII. Maintenance
Kooltronic Air-Cooled Air Conditioners require routine cleaning of the condenser coil and the air filters to assure
unimpeded airflow through the condenser heat exchanger. It is not possible to recommend specific condenser coil or
filter cleaning intervals, since the level and the nature of airborne particulate matter differs widely with each
installation. It is generally sufficient to clean the condenser coil and/or the aluminum mesh filter when the outer
surfaces appear covered with a thin layer of dust, lint or other foreign matter. The condenser coil can be washed
or blown out with air, depending on the foreign matter involved (see below - Filter and condenser coil service).
The aluminum mesh filter can be washed with warm water. Appropriate disposable replacement filters are available
from Kooltronic.
If routine condenser coil or filter service is neglected or delayed, the air conditioner will not perform at its design
capacity. The first indication of an excessively clogged condenser coil or air filter is usually a gradual increase of
temperature within the equipment cabinet. If operation is continued under these conditions, the compressor will be
shut off by the thermal overload device. The compressor will restart when its external temperature drops below the
protector threshold setting and the compressor will continue to cycle on and off. Continued operation under these
conditions will cause damage, shorten compressor life and void the warranty.
A. Filter and condenser coil service
The rear panel must be removed in order to clean the filters. After removal, the filters should be flushed
under warm running water with clean side up. If the accumulated dirt is oily, washing in a detergent bath
is recommended, followed by a warm water wash as above.
The exposed condenser coil must be cleaned by pressurized air or pressurized cleaning solution. Dirty
liquid will be removed through the condenser coil drain pan.
B. Blowers
The design life of the blowers used in all Kooltronic Air Conditioners is substantially in excess of 20,000
hours. All Kooltronic condenser and evaporator blowers are equipped with automatic-reset thermal
overload protectors.
CAUTION
If field replacement of a blower motor is necessary, most blower assemblies, including the mounting plate, are
readily removable. Each of the blower mounting plates is held to the air conditioner cabinet structure by screws
and nuts. For installation of the replacement blower, electrical connections may be broken at the terminal
block, or power leads may be cut and appropriately spliced together.
C. Compressor
All Kooltronic compressors are approved by UL and CSA, and require no maintenance. They are
hermetically sealed and charged at the factory, and equipped with automatic-reset thermal overload
protectors.
If the compressor fails, it is strongly recommended that the air conditioner be returned to Kooltronic for
service.
Before opening the air conditioner, disconnect all power.

15
. IX. Trouble-Shooting
Each Kooltronic Air Conditioner is engineered for performance and built for reliability. They are designed to
require only routine maintenance. If your air conditioner should require warranty service, please
contact Kooltronic. If you require service out of warranty, we have compiled a trouble-shooting chart
to assist your service personnel. If additional assistance is required contact Kooltronic at [phone].
Problem Cause Solution
Unit does not run. No Power. Check Power Source and electrical connection.
Check transformer fuses.
Check unit power cord connection to terminal block.
After initial 15 minute energization Return temperature is Normal Operation.
of air conditioner, compressor and between Thermostat set Check return air temperature.
condenser fan do not run. point and differential Check sensor connection on Thermostat.
(75°F to 86°F).
Unit not cooling. (Temperature Failed Thermostat Check Thermostat and Relay wire connections.
difference between return and or Relay. Replace Thermostat or Relay.
supply air is less than 10°F).
Evaporator Blower is running. Low Line Voltage. Check Nameplate Voltage against supply Voltage.
Compressor and Condenser Blower
do not run. Return temperature is Failed Compressor. Check Compressor wire connections.
above set point plus differential (90°F). Check Compressor overload.
Check Compressor Capacitor.
Replace Compressor.
D. Refrigerant Loss
Kooltronic Air Conditioners are subjected to a series of tests to detect refrigerant leaks, during and after
manufacture. It is possible that shipping or other damage, or microscopic leaks over a long period, may result
in the need for replenishment of refrigerant charge. When it has been verified by a Certified EPA Technician
that a refrigerant shortage does exist, the leak must be repaired. Then the unit may be evacuated and
recharged in the field by a Certified EPA Technician only.
CAUTION
E. Relocation
If your Kooltronic Air Conditioner has to be moved to another location by truck, the following precautions
should be taken:
■De-mount the air conditioner from the equipment, controller or enclosure.
■Conform to the applicable provisions of PROCEDURE FOR PROPER PACKING AND SHIPMENT OF
KOOLTRONIC AIR CONDITIONERS in this manual under Section III. "PRODUCT HANDLING".
Refer to the data on the unit nameplate which specifies the type of
refrigerant and the amount of charge in ounces.

16
Problem Cause Solution
Unit not cooling. (Temperature Failed Evaporator Blower. Check Blower wire connections.
difference between return and Check Blower Capacitor.
supply air is less than 10°F). Replace Evaporator Blower.
Compressor and Condenser Blower
are running. Evaporator Blower does
not run.
Unit not cooling. (Temperature Low Refrigerant charge. Check discharge and suction pressure for
difference between return and Refrigerant leak.
supply air is less than 10°F). Failed Condenser Blower. Check Blower wire connections.
Compressor and Evaporator Blower Check Blower Capacitor.
are running. Condenser Blower does Replace Condenser Blower.
not run.
Failed Condenser Blower Replace Condenser Blower Thermostat
Thermostat or Sensor. Replace Sensor
Unit not cooling. (Temperature Condenser or Evaporator Clean Coil.
difference between return and Coil clogged.
supply air is less than 10°F).
Evaporator Blower, Condenser Loss of Refrigerant. Locate and repair leak.
Blower and Compressor are running.
Ice on Evaporator Coil. Clean Evaporator Coil.
Check discharge and suction pressure for
Refrigerant leak.
Check for any obstruction of Evaporator airflow.
Check and seal all openings.
Excessive condensate Eliminate the frequency of door openings.
draining and loss of A/C
sensible cooling performance.
Unit overcooling. Failed Thermostat. Check Thermostat wire connections.
Evaporator Blower, Condenser Replace Thermostat.
Blower and Compressor are running. Failed Relay. Replace Relay.
Compressor cycling more than Short circuiting of air Provide baffle in the enclosure separating A/C.
10 cycles per hour. between A/C discharge outlet and inlet.
and inlet openings.
Excess vibration. Defective motor in Blower. Replace motor.
Defective wheel in Blower. Replace wheel.
Bad Compressor. Replace Compressor.

17